Newton's Laws --
1st Law -- the body is in rest until the experience any type of external force.
I.e F = 0.
Consider a following. Example.
Newton's 2nd law-- when we apply any type of force on body those force is directly proportional to the rate of change of momentum of that body
F = dp/dt, where momentum p = mv , v - velocity of body, m -- mass of body,
If mass is constant then, F = ma
Consider following example,
Newton's 3rd Law -- every action is equal and opposite reaction.
F1 = - F2
Consider following e.g.